/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.pinot.segment.local.utils;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.lang3.tuple.Pair;


public class SegmentLocks {
  private final LoadingCache<Pair<String, String>, Lock> _locks =
      CacheBuilder.newBuilder().weakValues().build(new CacheLoader<>() {
        @Override
        public Lock load(Pair<String, String> key) {
          return new ReentrantLock();
        }
      });

  public Lock getLock(String tableNameWithType, String segmentName) {
    return _locks.getUnchecked(Pair.of(tableNameWithType, segmentName));
  }

  // DO NOT use global lock because that can break tests with multiple server instances

  @Deprecated
  private static final SegmentLocks DEFAULT_LOCKS = create();

  @Deprecated
  public static Lock getSegmentLock(String tableNameWithType, String segmentName) {
    return DEFAULT_LOCKS.getLock(tableNameWithType, segmentName);
  }

  @Deprecated
  public static SegmentLocks create() {
    return new SegmentLocks();
  }

  @Deprecated
  public static SegmentLocks create(int numLocks) {
    return new SegmentLocks();
  }
}
